What is the operator called in TypeScript?
operator, which is known as the nullish coalescing operator. We can use this operator to provide a fallback value for a value that might be null or undefined .
What is || in TypeScript?
The double pipe operator ( || ) is the logical OR operator . In most languages it works the following way: If the first value is false , it checks the second value. If that’s true , it returns true and if the second value is false , it returns false .
Does TypeScript support operator?
Operator ?. is not supported in TypeScript version 2.0. It works really well with IntelliSense in Visual Studio.
What does && do in TypeScript?
The TypeScript specification states in §4.15. 6 about the && operator: The && operator permits the operands to be of any type and produces a result of the same type as the second operand.
What is == and === in TypeScript?
== : When comparing primitive values, like numbers and strings, this operator will apply a type conversion before doing the comparison. 1 == “1” evaluates to true . === : This operator does not do type conversions. If the types don’t match it will always return false .
Is Nullish TypeScript?
Nullish Coalescing is another new feature in TypeScript 3.7 which is closely related to Optional Chaining. It uses a unique operator: ?? , which serves as the default or “fall back” value when an expression evaluates to null or undefined .
What is the purpose of TypeScript?
Is Typeof TypeScript?
TypeScript comes with some built-in type guards: typeof and instanceof . They’re very useful, but have limited scope. For example, typeof can only be used to check string , number , bigint , function , boolean , symbol , object , and undefined types.
What is TypeScript correct?
Why was Elvis an operator?
The name “Elvis operator” refers to the fact that when its common notation, ?: , is viewed sideways, it resembles an emoticon of Elvis Presley with his quiff, or in the other direction, his smirk.